Comment Re:Just road traffic noise? (Score 2) 51
Even in totally undeveloped areas where you and your little teeny band of hunter-gatherer pals are the only thing going the wind is always up to something; some combination of birds and insects will be doing their thing depending on temperature, if there's a body of water of any size or moving water you'll hear some flow or wave action.
Could be pure intensity; a lot of modern noise is quite intense close to its source; could also be something about how it is interpreted and how readily it is or isn't discarded as background vs. forcing some amount of constant active attention.